^ T. Terada : 



Ms Gihu, licla, Kôhu, Takayama, ^Matiunoto, Nagano. 



M4 Kumagaya, Maebasi, Asio, Utunomiya. 



M5 Hukusima, Yamagata, INIidnsawa. 



Mg Aomori, Tappi, Hakodate. 



J Kumamoto, Nagasaki, Saseho, Saga, Hukuoka, Simono- 

 seki. 



J Hamada, Sakai. 



J Kyôgasaki, Maiduru, Kyoto, Hikone, Hukni. 



J Kaiiazawa, Husiki, ]\Iinatuki, Niigata. 



J Kamo, Akita. 



J Suttn, Sapporo, Kamikawa, Soya. 

 The above order of grouping may appear someAvhat arbitrary and 

 be liable to the oljjection that it takes no account of tlie peculiar 

 local cliniatic or physical features. This may, however, be justi- 

 fied if we consider tliat the principal aim of the present investiga- 

 tion is to sort out the general influence of the configuration of laiid 

 and water with respect to the centre of depression. Korea, Sagha- 

 line and Formosa were excluded, since these regions may obviously 

 stand under the influence of depressions existing bej'ond the limit 

 of the weather chart. 



The position of the centre of depression was determined not 

 only l:>y the daily chart, but also by consulting the chart of the 

 track of depressions given in " Kisyôyôran." The chart area was 

 divided into 2.5° square meshes and the position of the centre was 

 fixed Avithin one of these meshes. 



Our first procedure was to examine the daily charts one b}' one 

 and for each position of tlie centre to note doAvn the districts Avith 

 or Avithout precipitation. Here Ave met of course Avitli a difficulty. 

 In man}^ cases more than one centre appeared in the chart, to sa}' 

 nothing of the supposed shalloAV depressions appearing side by side, 

 especially in days Avitli generally small barometric gradient all over 

 the chart area. In .such a case, Ave are liable to an arbitrary pre- 

 judice in discriminating Avhether tlie precipitation in a given dis- 

 trict Avas due to the one or the other of the coexisting depressions. 

 Again, AA^hen an extensive depression is bifurcated, as is often the 

 case Avhen it is crossing over the main island, Ave cannot fix the 



